Ventilation Component Silencer Design to Reduce Pressure Loss
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Solution Overview
Problem
Existing ventilation components experience significant pressure losses due to the distance between impeller blades and the backdrop in the silencer, limiting their performance and sound absorption efficiency.
Innovation Solution
The design incorporates connecting links with a circumferential free space around them, allowing gas to flow freely on all sides, reducing pressure loss while maintaining sound absorption by arranging links at specific distances and using absorption materials like rock wool, and optimizing the geometry to minimize noise and overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between impeller blades and the silencer backdrop is reduced to improve sound absorption, then sound absorption efficiency improves, but pressure losses increase significantly
Solution Approach 1:
The patent transitions from traditional planar silencer baffles to three-dimensional connecting links that extend into the flow path. These links create circumferential free spaces around them, allowing gas to flow around all sides rather than being constrained to flow through narrow gaps between parallel baffles. This dimensional change enables simultaneous sound absorption and reduced pressure loss by providing multiple flow paths.
Solution Approach 2:
The silencer is divided into multiple connecting links arranged in series, each surrounded by circumferential free space. This segmentation allows the gas flow to be distributed around multiple links rather than being forced through a single narrow passage, reducing overall pressure loss while maintaining sound absorption through the absorption material in each link.
2Object-affected harmful factors
If traditional planar baffles are used in the silencer, then sound absorption is achieved, but the flow channels experience low flow speed and high pressure loss
Solution Approach 1:
The invention replaces two-dimensional planar baffles with three-dimensional connecting links that protrude into the flow path from the silencer backdrop. This creates circumferential free spaces that allow gas to flow around all sides of each link, increasing flow velocity by providing unobstructed flow paths in multiple directions rather than confining flow to narrow gaps between parallel surfaces.
Solution Approach 2:
The connecting links act as intermediaries between the silencer backdrop and the housing walls, creating circumferential free spaces that mediate the flow path. These links allow sound energy to be absorbed while simultaneously guiding gas flow around them, preventing direct contact between the backdrop and housing walls that would create restricted flow channels.
3Length of stationary object
If the silencer backdrop is placed close to the impeller blades to reduce overall length, then compactness improves, but pressure losses increase due to restricted flow
Solution Approach 1:
The patent uses three-dimensional connecting links with circumferential free spaces to allow gas flow to occur around all sides of each link. This enables the silencer to be positioned closer to the impeller blades without increasing pressure losses, as the gas is not forced through narrow gaps but can flow freely around the links in multiple dimensions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces pressure loss while maintaining or improving sound absorption, making the ventilation component more efficient and suitable for decentralized or central air-conditioning systems.
Implementation Method 1
Each connecting link 3 is surrounded on all sides by a circumferential free space 10 for the gas to flow, so that the flowing gas can flow around each link 3 on all sides
Data Source
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AI summary
The component has a channel-shaped casing (1) for accommodating silencer which is arranged behind the centrifugal fan (2) along air flow direction (4). A slot (3) filled with sound absorption material for noise reduction is provided in the casing, along air flow direction. The slot is formed in a circumferential free space (10) around which the gas is flowed. The number of regions of casing cross-section provided for slots, is corresponded to the number of theoretical cross-sectional areas of casing such that 64-81% of free flow cross-section of the casing is blocked.